An Egyptian protester falls down during clashes with riot police near Cairo's Tahrir Square on a day that has seen five deaths during the protests across the country. Photograph: Mahoud Khaled/AFP/Getty Images

A dolphin has been spotted in the Gowanus Canal in the Brooklyn borough of New York. The New York City Police Dept. said animal experts were waiting to see if the dolphin would leave on its own during the evening's high tide. If not, they plan to lend a hand on Saturday morning. According to authorities at the scene, the dolphin appeared to be adventurous, rather than stranded. Photograph: Richard Drew/AP

The tangled web of Egyptian politics. People took to the streets demanding the resignation of President Morsi and accusing his government of not enforcing social reforms quickly enough. Photograph: Amr Nabil/AP

As the full moon rises over the mountains Norway's Anders Bardal jumps during the official training session of the FIS Ski Flying World Cup in Vikersund, Norway. Photograph: Daniel Sannum Lauten/AFP/Getty Images

A Syrian boy stands in front of his family's tent at the Zaatari refugee camp in the Jordanian city of Mafraq, near the border with Syria. More than 30,000 Syrians have arrived in Jordan's main camp this year so far. Photograph: Muhammad Hamed/Reuters

Supporters of three detained opposition MPs protest in front of a court in the Kyrgyzstan capital, Bishkek, during their trial. The head of the nationalist opposition Ata-Zhurt party, Kamchybek Tashiev, was arrested last year along with two other MPs over their involvement in a demonstration demanding the nationalisation of the Canadian-owned Kumtor mine. Photograph: Vyacheslav Oseledko/AFP/Getty Images

An angry steelworker from a threatened ArcelorMittal plant in Liege, Belgium, runs away as police use a water cannon during a protest outside the prime minister's office in Brussels. Photograph: Yves Logghe/AP

Looking pretty exhausted, Andy Murray is congratulated by Roger Federer after their men's singles semi-final match at the Australian Open tennis tournament in Melbourne. Read the match report. Photograph: Tim Wimborne/Reuters

A woman looks at portraits of Henry VIII and Catherine of Aragon, displayed together for the first time in nearly 500 years, at the National Portrait Gallery in London. Discovered in Lambeth Palace, the Catholic queen's portrait had been thought to be that of the king's last wife, Catherine Parr, but experts suspected there may be more to the picture due to similarities with other known paintings of Catherine of Aragon. After work by the NPG restoration team, the painting is being displayed in the Henry and Catherine Reunited exhibition from today. Photograph: Leon Neal/AFP/Getty Images

Chinese Girl, the most famous work of Vladimir Tretchikoff, the Russian emigre who settled in South Africa, which will be sold for an estimated £300,000 at Bonham's London in March. Photograph: Bonhams/PA

Robotic arms assemble and weld the shell of a Nissan car on the production line in Sunderland, England. The Japanese manufacturer's factory employs 6,225 people and quite a few robots! Photograph: Christopher Furlong/Getty Images

A murga (musical theatre) carnival group parades and dances through the streets in the runup to the carnival celebrations in Buenos Aires, Argentina, that will start next week. For more around the world see 24 hours in pictures. Photograph: Natacha Pisarenko/AP

Cold protest: Greenpeace activists install banners on the roof of a petrol station to protest against global oil giant Shell in Davos, where the 2013 World Economic Forum is taking place. Photograph: Johannes Eisele/AFP/Getty Images

Egyptians carry a wounded protester as clashes erupt with riot police in Tahrir Square, Cairo. Crowds gathered in the square to demonstrate on the second anniversary of the revolution that ousted Hosni Mubarak. Follow events with our live blog. Photograph: Mohammed Abed/AFP/Getty Images

Bhutan's King Jigme Khesar Namgyel Wangchuck and Queen Jetsun Pema at the king's ceremonial reception in the forecourt of India's presidential palace Rashtrapati Bhavan in New Delhi. Bhutan's royal couple are on a week-long state visit to India. Photograph: Adnan Abidi/Reuters